21436166 has 8 divisors (see below), whose sum is σ = 32455080. Its totient is φ = 10617808.

The previous prime is 21436147. The next prime is 21436169. The reversal of 21436166 is 66163412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21436169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49871 + ... + 50298.

It is an arithmetic number, because the mean of its divisors is an integer number (4056885).

Almost surely, 2^21436166 is an apocalyptic number.

21436166 is a deficient number, since it is larger than the sum of its proper divisors (11018914).

21436166 is a wasteful number, since it uses less digits than its factorization.

21436166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100278.

The product of its digits is 5184, while the sum is 29.

The square root of 21436166 is about 4629.9207336627. The cubic root of 21436166 is about 277.7894218171.

Adding to 21436166 its reverse (66163412), we get a palindrome (87599578).

It can be divided in two parts, 214 and 36166, that multiplied together give a square (7739524 = 2782²).

The spelling of 21436166 in words is "twenty-one million, four hundred thirty-six thousand, one hundred sixty-six".